Pietra was neither a great race mare nor a great producer of winners, but her daughters almost all proved to be good broodmares. Pietra's family made her one of the early foundation mares of the Hancock family's famous Claiborne Farm.

Race record

A winner.

As an individual

A bay mare; no further information available.

As a producer

Pietra's important foals are as follow:

Brocatelle (1915, by Radium) was imported to the United Statesin 1915 along with her dam. She is the dam of 1928 American Derby winner Toro (by The Porter), 1931 Adirondack Handicap winner Brocato (by The Porter) and 1935 Havre de Grace Handicap winner Good Goods (by Neddie), whose claim to fame was siring two-time American champion Alsab. Brocato, in turn, is the second dam of 1957 Santa Anita Handicap and San Juan Capistrano Invitational Handicap winner Corn Husker (by Endeavour II) and of multiple stakes winner Try It (by Endeavour II), a tough campaigner on the Southwestern circuit. Brocatelle also produced Outburst (by Messenger), dam of the good handicapper Aneroid (by The Porter), and Light Brocade (by The Porter), dam of multiple stakes winner Master Bid (by Psychic Bid) and second dam of stakes winners Pajone and Cardiff.

Irish Lassie (1919, by Celt) produced Easter Stockings, winner of the 1928 Kentucky Oaks and generally considered the American co-champion 3-year-old filly of 1928. She also produced Wee Shane (by Bright Knight), second dam of 1960 Arkansas Derby winner Spring Broker.

Pietra was imported to the United States in 1915 by Arthur B. Hancock, Sr., who bred all her American foals.

Pedigree notes

Pietra is inbred 4x3 to the English matron Mabille (the foundation mare of Family 2-o), 5x4 to seven-time English champion sire Stockwell and 5x5 to Stockwell's dam, the epochal broodmare Pocahontas. She is by 1901 Jockey Club Stakes winner Pietermaritzburg (by St. Simon) out of 1888 One Thousand Guineas winner Briar-Root (by Springfield), making her a half sister to the useful racer Pomegranate (by St. Simon's champion son Persimmon). Pomegranate, in turn, produced Prunus (by Dark Ronald), a dual Classic winner and five-time champion sire in Germany. Another half sister to Pietra, Brielle (by ﻿Martagon﻿) is the third dam of Caruso, a good stakes winner remembered primarily as the sire of Imperatrice, second dam of the great Secretariat.

Briar-Root was produced from the Hermit mare Eglentyne and is a full sister to White Lilac, second dam of WRC St. Leger Stakes winner Satrap. She is also a half sister to Rebecca (by Master Kildare), dam of Austrian Two Thousand Guineas winner Mako (by Morion) and ancestress of Italian Classic winners Peruviana, Marcantonio, Piavola, Leon de San Marco and Peveron. Another half sister to Briar-Root, Rose Garden (by Kingcraft) is the third dam of 1913 English champion 2-year-old male and important sire The Tetrarch and of 1912 Russian Oaks winner Coup d'Or.